The Alemite DEF (Diesel Exhaust Fluid) Hose Reel 8072-A is designed to dispense Diesel Exhaust Fluid (DEF) which is also known as aqueous urea solution 32 (AUS 32). DEF is a 32.5% solution of high-purity urea in demineralized water which is injected into diesel engine exhaust by a selective catalyst reduction (SCR) system to reduce nitrogen oxide emissions.